题目内容
14．-Which invention do you like best？-QQ．It is an invention ____________ can help us communicate with others online freely．（ ）
| A． | what | B． | that | C． | who |
分析 --你最喜欢哪项发明？
--QQ，它是一项帮我们在网上和别人自由交流的发明．
解答 答案：B；
首先分析句子结构，本句中的"______ can help us communicate with others online freely"在复合句中作定语从句，由于先行词invention 为下文定语从句的逻辑主语，且指物，所以引导定语从句的关系代词用that或者which，故选B．
点评 本题考查定语从句的关系代词．做此题的关键是找准先行词，是人还是物，在从句中做什么句子成分，然后根据语法选择正确的引导词．
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